Valve for steam-engines



(No Model.)

l J. P. LISK.-

VALVE FOB. STEAM ENGINES.

Patented Dec. 18, 1888..

Inl/en far;

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NiTnD STATES PATENT Orricn.

JOSEPH P. LISK, OF MAOEDON, ASSIGNOR OF TlVO-THIRDS TO GILBERT F.EVERSON AND LOUIS P. EN lEL, OF PALMYRA, NEIV YORK.

VALVE FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 394,930, dated December18, 1888.

l Application filed May 12, 1888. Serial No. 273,650. (No model.)

To @ZZ 'whom 1725 may concern:

Be it known that I, JOSEPH P. LIsK, of Macedon, in the county of lVayneand State of `bew York, have invented a new and useful ImprovementinValves for Steam-Engin es, which improvement is fully set forth in thefollowing speeiication and shown in the accompanying drawings.

My invention relates to the manner of letting steam into and out of thesteam-cylinders; and the object is to construct the valve and ports insuch a manner that steam will be admitted from the steam-chest into thecylinder through two independent openings at each end of the cylinderand out through the same in the act of exhausting, the valve beingperfectly balanced as to the action of steam upon it.

The invention is hereinafter more :fully described, and particularlypointed out in the claim.

Referring to the drawing, Figure l is a view at the end of the cylinder,the latter, with the steam-chest, being transversely sectioned, as onthe line in Fig. 2 and viewed as indicated by the arrow pointed thereon;Fig. 2, a longitudinal section ot' the cylinder and steam-chest, takenas either on the upper or lower dot-ted line y y in Fig. 'l and viewedas indicated4 by either of the arrows pointed on said respective lines,both views being exactly alike; Fig S, a transverse section ol' theparts, taken on the dotted line ,e in Fi 2 and viewed in the samedirection as lilig. l; Fig. i, a longitudinal section of thesteam-chest, taken on the dotted line fr in Fig. l and viewed asindicated by the arrow pointed on said line; Fig. 5, aview of one of theequal faces of the valve, a part being broken away; and Fig. il, a viewtaken at the end of the valve.

Referring to the parts shown, A is the cylinder of a steam-engine, andl5 the steamchest. I

O is a valve within the steam-chest, and a the valve-rod. Thesteam-chest contains within it two val ve-seats, l) l), both alike andopposite each other, as shown, said valve-seats each bei ng pierced byinlet and exhaustports c c and (l, substantially of common form. Thefour inlct-tmenings of the two valve-seats communicate with the interiorof the cylinder through four separate ports, e e, by means of sidepipes, f f. The exhaust-port in each valve-seat leads into a passage, g,which passages unite at h in a common exhaust or exit opening for thecylinder.

The valve is formed with two similar oppositely-turned faces, 'i i, tomeet the respective valve-seats l) b to open and close the variousports, as hereinafter more fully explained. It will be seen from Fig. 4that two inlet-openings for live steam to one end of the cylinder aremade simultaneously by the valve, the two currents of steam liowingtherein entering the same end of the cylinder, but upon opposite sidesthereof. It will also be seen that the exhaust-steam from the oppositeend of the cylinder has two passages out from the cylinder open to it atthe same time by the valve. By this construction twice the area ofopening is formed for the inflow of steam to either end of the cylinderfor the same amount of travel of the valve in making either its forwardor backward movement. This is important, for the shorter the travel ofthe valve the less is the power of the engine taxed to drive it.

Both of the workin gfaces of the valve being equal and equally actedupon bythe steam at any given moment, the valve is perfectly ballancedso far as the action of the steam upon it is concerned. I make the valvein two equal parts, 7.1, and bolt them together, as shown, back to back.The valve-rod is provided with a longitudinal conical piece, Z, littedto a conical opening formed one-half in each of said parts 1.1 k of thevalve. This cone acts as a spreader for the two halves of the valve, bymeans of which they maybe set apart to meet more closely the opposing'valveseats b l), to compensate for the wear of the same. Collars a "aare secured to the valverod by set-screws or other similar and wellknownmeans-one on each side of the valve. One of these collars bears against.the large end of the cone, while the other one bears directly againstthe side of the valve. By this means the cone is held relatively toplace when the halves of the valve havebeen properly adjusted to thevalve-seats.

The valve-rod passes through a stufing-box, D, ot' common form in theside of the steam- IOO Chest, and the live steam l'roni the boilersenters the Steam-chest through an opening, E, Conveniently formed and ofthe usual kind.

The opening 7L for the exit of the steam from The cylinder is formed ina cap or dome, F, secured To the open sido ol' the steam-chest. To thisCap the exhaust-pipe is Secured in the usual manner.

lVhat I claim as 1n y invention is" A steam-ongine formed with similarparallel and opposing' Valve-Seats, each having inlet-portsconnnunicatingl with the interior of the cylinder, and an exhaust-port,in Combination with a valve for the seats, a valverod passing throughthe valve, the latter bei ng divided on a plane parallel With theValveseats and on tho axis of tho rod and formed with a longitudinalconical oavity,onel1alf in oaoh, a conical Sleeve shorter than the valvein said cavity upon the rod, and retainingoollars on the rod on eachSido of the valve, Substantially as shown.

J OSEPH P. LISK. \\"ilinossos:

E. B. WHITMORE, M. L. MCDERMOTT.

